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E. T.
Python Development Techdegree Student 884 PointsHow to print inventory as a list rather than printing its items one at a time?
how to write a method for that?
3 Answers
Megan Amendola
Treehouse TeacherI can help better if you post your code E.T.
When I use the code I wrote above it works fine:
class Inventory:
def __init__(self):
self.inventory = []
def get_inventory(self):
return self.inventory
def add_item(self, item):
self.inventory.append(item)
inventory = Inventory()
inventory.add_item('grapes')
inventory.add_item('bananas')
print(inventory.get_inventory())
---Console---
['grapes', 'bananas']
If you're getting object locations, then I am assuming your list is filled with objects of another class. Something like this:
class Inventory:
def __init__(self):
self.inventory = []
def get_inventory(self):
return self.inventory
def add_item(self, item):
self.inventory.append(item)
class Item:
def __init__(self, item):
self.item = item
def __str__(self):
return self.item
def __repr__(self):
return self.item
inventory = Inventory()
inventory.add_item(Item('grapes'))
inventory.add_item(Item('bananas'))
# this uses __repr__
print(inventory.get_inventory())
# this uses __str__
for item in inventory.inventory:
print(item)
---Console---
[grapes, bananas]
grapes
bananas
That means you need to add a __str__ method to access each item in your list. If you want to see your list print to the console, then you'll need a __repr__. Here's some more detail on the two. Print a list works differently than just printing out an individual object.
Megan Amendola
Treehouse TeacherHi, E. T.
You can add a method to your class to print() or return the list depending on what you want to do with it. For example:
class Inventory:
def __init__(self):
self.inventory = []
def get_inventory(self):
return self.inventory
E. T.
Python Development Techdegree Student 884 PointsMegan Amendola Still not getting it. I want to print the list. I tried after adding get_inventory() method:
>>> inventory.slots
<items.Item object at [address] >, <items.Item object at [address]>
It's giving me the addresses rather than showing what items are in that list!
E. T.
Python Development Techdegree Student 884 PointsMegan Amendola Thanks a ton :)
If you want to see your list print to the console, then you'll need a
__repr__.....Print a list works differently than just printing out an individual object.
This helps.